Extractor in presses



May 26, 1931. H. J. wlSER EXTRACTOH IN PRESSES Filed June 2, 1930 2 sheets-sheet 1 May 26, 1931. H. J. WISER 1,807,461

EXTRACTOK IN PRESSES Filed June 2, 195o 2" sheets-sheet 2 Patented May 26, 1931 PATENT OFFECE HENRY J. WISVER, 0F OTTAWA, ONTARIO,

FIBREBOARD, LIIIIITED, OF

CANADA, ASSIGNOR TO INTERNATIONAL GrATI1\l'lEl.AUL QUEBEC, CANADA EXTRACTOR IN PRESSES Application mea Tune 2,

This invention relates to apparatus for extracting the products of presses and is more especially applicable to presses for manufacturing wallV boards from wood pulp.

The sheet of compressed pulp produced by such a press is not self-supporting until it has been dried and there is some diiiiculty in removing the sheets of moist pulp from the press without damaging them. The object of the invention is to provide an improved eX- tracting apparatus which is free from the difficulty mentioned above.

The invention consists in the arrangement, construction and combination of parts hereinafter described and more particularly pointed out in the appended claims.

Referring now to the accompanying drawings, which illustrate, by way of example, one convenient embodiment of the invention,

Figures 1 to 4 inclusive are diagrammatic side elevations indicating successive positions of the invention duringv operation,

Figure is a side elevation of the invention on a larger scale, and

Figure 6 is a diagrammatic end elevation,

partially in section, of a press embodying the present invention.

The invention is applicable to any press for the manufacture of boards from wood or like pulp of the kind in which the pulp is pressed. between two dies or plattens. The type of press to which the invention is shown applied inthe drawings comprises a stationary upper die 1, a vertically movable lower die 2 and a vertically movable sleeve or deckle 3 which slidably engages the vertical walls of the upper die 1. A. pulp inlet 4 is provided on the sleeve 3. The dies 1 and 2 are hollow and their adjacent walls are perforated. Pipes as indicated at 5 are provided for connecting the interior spaces of the dies 1 and Q to a source of sub-atmospheric pressure. An endless chain or the like 6, carried by wheels 71, 72, 73, 74 is provided on each side of the press andtransverse members 8 connect the two chains along a limited portion of their length.

Figure 1 illustrates in diagram the initial position of the parts. In this position the space between the dies 1 and 2 is closed by the 1930. Serial No. 459,000.

sleeve 3, and into this space the requisite quantity of pulp Ais fed through the inlet 4. The lower die 2 is then raised, for example, by a hydraulic plunger 9, into the position shown in'Figure 2. The sleeve 3 is carried up with the die 2 and during this operation the pressure inside the dies is reduced to cause moisture to be withdrawn from the pulp.

Atmospheric pressure is then restored in the movable die 2 and thelatter is lowered to its initial position. The reduced pressure is maintained in the top die 1 to prevent the compressed pulp 10 from falling with the die 2.

The extractor, which constitutes the present invention, is then operated to move the chains 6 in the direction of the arrows to bring the transverse supporting members 8 into position beneath the pulp 10', as shown in Figure 3. rlhe movement of the extractor is then arrested, and superatmospheric pressure is created in the interior of die 1 to blow the sheet of pulp 10 from the die on to the supporting section 8 of the extractor. Thereafter the extractor is again direction of the arrows, and after passing the Wheels 73, the supporting members move in a downward direction, but the pulp sheet 10 ias suiiicient rigidity to retain its horizontal position and pass straight on to a suitable conveyor 11 (Figure 4), which carries it on to a dryer, not shown. Means, such as an inclined plane 12, ymay be provided between the extractor and the adjacent end of the conveyor be carried down with the extractor. As soon as the sheet of pulp 10 has been extracted, the sleeve 3 is moved down under the control, for instance, of a hydraulically operated plunger 9a and the 'cycle of operations is repeated.

Referring to Figure 5, which shows a fragmentary side elevation of one convenient form of the invention, it will be seen that the chains 6 comprise uniformly spaced rollers 6a connected by links 6*.

The transverse supportingmembers 8 are secured at their ends to brackets 8a which in turn are secured to laterally projecting flanges on the links 6c of the chains 6.

moved in the f 11 to ensure that the pulp will not 

